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Aspirator

  • US 5,195,961 A
  • Filed: 03/18/1991
  • Issued: 03/23/1993
  • Est. Priority Date: 04/20/1988
  • Status: Expired due to Fees
First Claim
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1. An adjustable pressure aspirator comprising:

  • aspirating means for removing material by aspiration;

    a receiving vessel connected to said aspirating means, said receiving vessel having an interior for collecting the material removed by aspiration;

    vacuum means for producing a vacuum pressure within said receiving vessel;

    pressure detecting means for detecting said vacuum pressure within said receiving vessel;

    a vent for connecting the interior of said receiving vessel with atmosphere external to said vessel, said vent having an opening of variable size; and

    pressure control means for controlling the vacuum pressure within the interior of said receiving vessel to maintain a constant pressure by adjusting the size of said opening, responsive to said detected vacuum pressure.

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